Airbrushing race helmet, legal?

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Hey, just wondering if anyone can shed some light on the airbrushing a race helmet. I have done a bit of a google search and it comes up with lots of websites that do airbrush helmets, can't seem to find anywhere that mentions the legality of it? I was always under the impression that doing anything to your helemt voided the warranty or what not, deeming it unusable?